Reiseberichte, Fotos, Bilder, Reiseinformation, Reisetipps weltweit. Schreiben Sie Ihren Reisebericht. Zeigen Sie Fotos und Bilder online. Reiseerfahrung mit anderen teilen!
reisenzeigen --- HOMEPAGE   INFO 
  Startseite 
      31116 Bilder   2264 Berichte
   

 
  THEMEN
ABENTEUER
KLETTERN
MOTORRAD
PROMIS
RADFAHREN
RAUMFAHRT
SAFARIS
STRÄNDE
STÄDTE
TSUNAMIspezial
TAUCHEN
TIERE
VIDEOS
WANDERN
WELTREISE
WINTER / SKI
WITZIGE BILDER
  SERVICE
aktuelle Nachrichten
  bisher 441 mal gesehen     Zurück zum Bericht | alle Bilder dieser Serie | alle Bilder dieses Autors 
  FotoFoto 4 von 14Foto  
Bild Nr. 13436 - 441 mal gesehen
This artist's animation depicts one of the most widely accepted theories pertaining to the origin of comets.

The simulation opens with a protoplanetary disk, which will eventually turn into a solar system. The fiery yellow ball in the center represents a star like our Sun.

Like a raindrop forming in a cloud, a star forms in a diffuse gas cloud in deep space. As the star grows, its gravitational pull draws in dust and gas from the surrounding molecular cloud to form a swirling disk called a "protoplanetary disk." This disk eventually further consolidates to form planets, moons, asteroids and comets.

As the animation zooms into the disk, micron-size particles of dust can be seen sticking together to form centimeter- and millimeter-sized rocks. As the rocks become more massive, gravity takes over, forcing other surrounding pebbles and dust particles to collide with the larger rocks. The process continues until a comet is born.

Since comets form far from their star in the icy regions of the planetary system, molecules, such as water, carbon dioxide and methane, freeze onto the micron-sized dust particles and rocks before they collide to form a comet.

Once a solar system is formed, the gravitational pull from large planets manipulates a comet's orbit and brings it into the inner solar system. As the comet approaches its star, sunlight warms and transforms the frozen gas on and just below the comet's surface directly into vapor, effectively bypassing the liquid phase. This process is called sublimation.

Sublimation of the molecules beneath the surface forces streams of gas and dust to jet out of the comet, creating an aura or "coma" around the rock. Interactions between ingredients in the coma with surrounding sunlight and solar winds eventually create the comet's tail, pictured here at the end of the animation.

This movie is courtesy of NASA's Spitzer Science Center at the California Institute of Technology, Pasadena, Calif.

Image credit: NASA/JPL-Caltech


Bookmark and Share
Aktueller Bericht: Deep Impact, Tempel 1 Photos / Bilder
Autor des Berichts: Andi Karr
erstellt: 04.07.2005
bisher gesehen: 441 mal
Stichworte: Raumfahrt, Deep Impact, Tempel 1, Komet, Photos

The last comments for

Hai frisst Taucher - Bilder und Videos von Hai Attacken

17029009482

A blog comment website that fosters engaging discussions and insightful feedback on a wide range of topics,...

October 08, 2024 10:16:18 Jump to

The last comments for

Reiseberichte, Reiseinformationen, Reisetipps. Reiseerfahrungen und Reisebilder weltweit.

trendwire

This article provides a comprehensive overview of the current situation. I appreciate the balanced p...

October 03, 2024 07:25:35 Jump to

The last comments for

Berlin Marathon 2006 - Bilder der schnellsten Läufer

Berlin

Der Berlin-Marathon (Marke BMW Berlin-Marathon für Sponsoring Gründen) ist eine große...

October 06, 2015 21:13:44 Jump to

The last comments for

My trip to Vietnam - Hanoï, Halong Bay, Sapa and Hoi An

Halong bay tours

some beautiful pictures in Halong Bay.
<img> January 02, 2015 07:27:37 Jump to

The last comments for

My trip to Vietnam - Hanoï, Halong Bay, Sapa and Hoi An

Halong bay tours

Halong bay ;)

January 02, 2015 07:14:48 Jump to

Seite generiert in 0.01sec     © www.reisenzeigen.de